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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b58d4ce7d77dde511722b711cb1c95e282403473bd8a2ae57909a627faeb81' 
  AND token = 'Rdw0k+FCPqdAZvlGSU/rjUNu2A3OgKe8ZldBHxbSACc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}